Adaptive optimum start/stop control system

• US 4,522,336 A
• Filed: 12/09/1982
• Issued: 06/11/1985
• Est. Priority Date: 12/09/1982
• Status: Expired due to Term

• Current Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Culp, Charles H.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US06/448,148
• Time in Patent Office: 915 Days
• Field of Search: 236/46 R, 236/4 T, 165/12, 62/231, 364/148, 364/152
• US Class Current: 236/46.00R
• CPC Class Codes: G05D 23/1904 variable in time

Abstract

An adaptive optimum start/stop controller for controlling an air treatment apparatus at a reduced energy consuming level during periods of non-occupancy of a building and for energizing the air treatment apparatus before occupancy so that the building is comfortable by occupancy, the controller including a temperature sensor for sensing space temperature within the building, a controller responsive to the temperature sensor and to real time for determining optimum start/stop times so that the building is controlled at energy conservation levels during non-occupancy and comfortable levels during occupancy, the controller adjusting the optimum start/stop times based upon the accuracy of prior start/stop times, and a communication channel for connecting the controller to the air treatment apparatus.

Claims

1. An adaptive optimum start/stop controller for controlling an air treatment apparatus at a reduced energy consuming level during periods of non-occupancy of a building and for energizing the air treatment apparatus before occupancy so that the building is comfortable by occupancy, said controller comprising:

temperature sensing means for sensing space temperature within said building;

controller means responsive to said temperature sensing means and to real time for determining optimum start/stop times so that said building is controlled at energy conservation levels during non-occupancy and comfortable levels during occupancy, said controller means adjusting said optimum start/stop times based upon whether space temperature attained a desired temperature during a prior start/stop operation within an accuracy window of time encompassing the start of a corresponding prior occupancy/non-occupancy period; and

,

communication means adapted to connect said controller means to said air treatment apparatus.

2. The controller of claim 1 wherein said controller means comprises means for adjusting said optimum start/stop times by a factor which varies dependent upon the deviation between said window and an actual corresponding time when said space temperature within said building reached said desired temperature during said prior start/stop operation.

3. The controller of claim 2 wherein said controller means comprises means for increasing said factor if said space temperature reaches the desired temperature later than said window.

4. The controller of claim 3 wherein said controller means comprises means for decreasing said factor if said space temperature reaches the desired temperature before said window.

5. An adaptive optimum start controller for controlling an air treatment apparatus at a reduced energy consuming level during periods of non-occupancy of a building and for energizing the air treatment apparatus at start times before occupancy so that the building is made comfortable by occupancy, said controller comprising:

temperature sensing means for sensing space temperature within said building;

controller means responsive to said temperature sensing means and to real time for determining optimum start times so that said building is controlled at a reduced energy consuming level during non-occupancy and at a comfortable level during occupancy, said controller means adjusting said optimum start times based upon whether space temperature attained a desired temperature during a prior start operation within an accuracy window of time encompassing the start of a corresponding prior occupancy period; and

,

communication means adapted to connect said controller means to said air treatment apparatus.

6. The controller of claim 5 wherein said controller means comprises means for adjusting said optimum start times by a factor which varies dependent upon the deviation between said window and an actual corresponding time when said space temperature within said building reached said desired temperature during said prior start operation.

7. The controller of claim 6 wherein said controller means comprises means for increasing said factor if said space temperature reaches the desired temperature later than said window.

8. The controller of claim 7 wherein said controller means comprises means for decreasing said factor if said space temperature reaches the desired temperature before said window.

9. A method for controlling an air treatment apparatus at a reduced energy consuming level during periods of non-occupancy of a building and for energizing the air treatment apparatus at start times before occupancy so that the building is made comfortable by occupancy, the method comprising the steps of:

sensing space temperature within said building;

determining rate of temperature change based upon the sensed temperature and real time which is required by the air treatment apparatus to drive the temperature of the building through a temperature change;

determining adjustment time based upon the rate of temperature change and the difference between actual temperature during setback and desired temperature at beginning of occupancy;

providing an accuracy window of time around the beginning of occupancy;

adjusting the adjustment time based upon whether space temperature attained a desired temperature during a prior start operation within said accuracy window of time encompassing the start of a corresponding prior occupancy period; and

,

initiating operation of the air treatment means at a time defined by the beginning of occupancy less the adjusted adjustment time.

10. The method of claim 9 wherein said step of adjusting the adjustment time comprises the steps of applying a factor to the adjustment time, the factor varying dependent upon the deviation between the actual time at which space temperature is brought to said desired level and said window of time.

11. The method of claim 10 wherein the step of adjusting the adjustment time based upon the accuracy of prior adjustment times comprises the step of increasing the factor if the time at which the space temperature is brought to the desired level falls later than the window.

12. The method of claim 11 wherein said step of adjusting the adjustment time based upon the accuracy of prior adjustment times comprises the step of decreasing the factor if, during the previous start operation, the space temperature is brought to the desired level earlier than the window.